Short blade hydrodynamic fin design balances propulsion force while maintaining kicking tempo. Convex blade and pass through vents promote optimum speed. Blade curvature and ridges increase pressure on up kick balancing propulsion and muscle work load. Open heel offers greater ankle flexibility and comfort.

S = Green (mens sizes 4-6)
M = Blue (mens sizes 7-9)
L = Grey (mens sizes 10-12)
XL = Black (mens sizes 13-15)
Female size down 1 or 2 sizes.